What is Fresnel Lens&colon; The Fresnel lens was invented by French physicist Augustine Fresnel&comma; the Augustin Fresnel first used this lens design to build a glass Fresnel lens - lighthouse lens in 1822&period;

The Fresnel lens is a thin&comma; flat optical lens which consists of a series of small narrow concentric grooves on the surface of a lightweight plastic sheet in order to reduce the thickness&comma; weight and cost&period; Each groove is at a slightly different angle than the next and with the same focal length in order to focus the light toward a central focal point&period; Every groove can be considered as an individual small lens to bend parallel Fresnel light waves and focus the light&period; The lens actually eliminates some spherical aberration&period;

The Fresnel lens is a special optical lens&period; It can now be made from plastic such as acrylic fresnel lens&comma; PMMA&comma; polyvinyl cholride &lpar;PVC&rpar;&comma; polycarbonate &lpar;PC&rpar; and HDPE&period; A traditional glass convex lens would be thick&comma; heavy and very expensive&comma; but a plastic Fresnel lens is a thin&comma; flat&comma; lightweight and low cost alternative&period;

A high groove density has a better quality projection image&period; The Fresnel lens is a good solution for quality image and efficiency at a significantly lower cost&period; The Fresnel lens is usually corrected for spherical aberration&period;

Advantages of Fresnel Lens&colon; The Fresnel lense can be designed and manufactured in very large sizes with light weight due to less than 4mm thickness&comma; so the cost will be lower than traditional magnifiers&period; In contrast&comma; a conventional glass lens would be 200mm thick at the edge&comma; weigh over 50kgs and cost thousand of dollars&period;

Significantly reduced lens thickness results in a substantial savings in material cost&period; Fresnel lenses can reduce weight&comma; which reduces mounting and assembly cost&period; Extremely giant Fresnel lens up to 1000mm can be used to replace a very expensive conventional mirror assemblies in large optical systems&period;

Design of Fresnel Lens&colon; To determine the optical Fresnel lens design equation&comma; all of the parameters are determined for each individual application&period; Several Fresnel zone formulas are used in Fresnel technologies for precision diamond tooling machines and electroforming and molding processes&period;